package com.itheima.controller;

import com.itheima.common.R;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.UUID;

@RestController
@RequestMapping("/common")
public class CommonController {

    @Value("${reggie.path}")
    private String basepath;

    @Autowired
    private HttpServletResponse response;

    @PostMapping("/upload")
    public R upload(MultipartFile file) {
        //使用UUID重新生成文件名，防止文件名称重复造成文件覆盖
        UUID uuid = UUID.randomUUID();
        //原始文件名
        String originalFilename = file.getOriginalFilename();
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        //组合成的新文件名
        String newfile = uuid + suffix;
        //创建一个目录对象
        File dirs = new File(basepath);
        //判断目录是否存在
        if (!dirs.exists()) {
            //不存在则创建
            dirs.mkdir();
        }
        try {
            //将临时文件转存到指定位置
            file.transferTo(new File(basepath + newfile));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(newfile);
    }

    @GetMapping("/download")
    public void download(String name) throws IOException {

        try {
            FileInputStream fis = new FileInputStream(new File(basepath + name));

            ServletOutputStream os = response.getOutputStream();

            response.setContentType("imags/jpeg");
            int len = 0;
            byte[] bytes = new byte[1024];
            while ((len = fis.read(bytes)) != -1) {
                os.write(bytes, 0, len);
                os.flush();
            }
            fis.close();
            os.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }
}
